Resonant RF Power Device for Plasma Production
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Solution Overview
Problem
Conventional RF power transfer devices suffer from inefficiencies due to significant power dissipation in parasitic elements, high ohmic losses, and limitations to sine wave power supplies, with existing solutions relying on matching-boxes that fail to optimize power transfer effectively.
Innovation Solution
A device intrinsically designed to resonate, featuring a capacitive and inductive element configuration that freely resonates at its optimal frequency, minimizing parasitic impedance effects and allowing efficient RF power transfer with high equivalent impedance, enabling operation with both sine and square wave power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a matching-box with additional reactive elements is used to adapt the load impedance, then power transfer maximization is achieved at resonance frequency, but significant power is dissipated in parasitic elements and ohmic losses increase
Solution Approach 1:
The patent extracts and eliminates the matching-box component from the conventional RF power transfer system. By designing the inductive device with intrinsic resonance capability through carefully selected L and C values, the system achieves impedance adaptation without requiring external matching elements, thereby removing the source of parasitic power dissipation and device complexity
Solution Approach 2:
The inductive device is designed to be self-resonant by incorporating a capacitor in parallel with its inductive winding, tuned to resonate at the operating frequency. This self-service mechanism provides intrinsic impedance matching without external components, eliminating power loss in matching-box parasitic elements while maintaining simplicity
2Loss of energy
If the substantially inductive device has low inductive impedance modulus comparable to parasitic elements, then resonance frequency operation is achieved, but power transferred is divided between device and parasitic elements causing significant dissipation
Solution Approach 1:
The patent changes the impedance parameters of the inductive device by selecting specific values for inductance L and capacitance C such that the device resonates at the operating frequency with high impedance. This parameter optimization ensures that the device impedance dominates over parasitic elements, directing power transfer to the intended load rather than dissipating it in parasitic components
3Adaptability or versatility
If conventional matching-box solutions are used with variable and fixed capacitances, then impedance adaptation is achieved, but the system requires sine wave power supplies and cannot operate with other waveforms
Solution Approach 1:
The patent creates a universal inductive device with intrinsic resonance capability that can operate with various power supply waveforms including sine, square, and other periodic signals. The resonant L-C circuit design provides waveform-agnostic operation, making the device multi-functional and adaptable to different power sources without requiring complex waveform-specific matching networks
4Reliability
If the inductive device operates without intrinsic resonance design, then simpler device structure is achieved, but significant reflected power is transmitted back to the RF power supply requiring specialized power supplies
Solution Approach 1:
The patent applies the principle of resonance (analogous to mechanical vibration) to the electrical L-C circuit, where the inductor and capacitor oscillate energy back and forth at a natural resonant frequency. This resonant oscillation creates a high impedance condition that prevents power reflection back to the source, eliminating the need for specialized power supplies capable of handling reflected power while maintaining simple device structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves high electromagnetic field intensity for efficient RF power transfer, reducing ohmic losses and enabling the use of non-standard RF amplifiers, while maintaining high efficiency and reliability.
Implementation Method 1
A device intrinsically designed to resonate, featuring a capacitive and inductive element configuration that freely resonates at its optimal frequency
Data Source
AI summary
The present invention regards a device intrinsically designed to resonate, suitable for RF power transfer, particularly usable for the production of plasma and electrically connectable downstream of a radio frequency power supply with fixed or variable frequency, comprising at least one inductive element (Lp), which can be powered, during use, by such at least one power supply; at least one capacitive element (Cp) electrically connected at the terminals of such at least one inductive element (Lp); such at least one device having a resonance angular frequency equal to: ωo=1/√LpCp. The capacitive element (Cp) and the inductive element (Lp) have values such that, at resonance state, they provide an equivalent impedance, measured at the terminals of such device, substantially of resistive type and much greater than the value of the parasitic impedance upstream of such terminals of such device, such that the effect of such parasitic impedance is, during use, substantially negligible.